Scrap Your Boilerplate (SYB) is a library for generic programming in Haskell. It is supported since the GHC >= 6.0 implementation of Haskell. Using this approach, you can write generic functions such as traversal schemes (e.g., everywhere and everything), as well as generic read, generic show and generic equality (i.e., gread, gshow, and geq). This approach is based on just a few primitives for type-safe cast and processing constructor applications.

It was originally developed by Ralf Lämmel and Simon Peyton Jones. Since then,many people have contributed with research relating to SYB or its applications.

More information is available on the webpage: http://www.cs.uu.nl/wiki/GenericProgramming/SYB